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Viruses: If you have a major problem with your computer, viruses are one of the first things a computer technician will investigate. As of late -2002 a virus known as "Klez" caused more wide-spread damage than any other virus to date. They come in many shapes and sizes. The most common way of transmitting a virus these days is through e-mail. Without going into detail, there are boot sector viruses (they load as soon as the PC is turned on), Trojans (hide them selves inside other programs), poly-morphic (they recreate themselves with new names to avoid detection from anti-virus software), and your simple virus that activates at a given time, or when it is run. A great many of the newer viruses (Klez, I Love You, etc.) not only infect your computer, but they copy your address book (all the people you communicate with via email), and send a copy of the virus to them. There are web-sites that can create virus like activity on your PC. Some of the ways that this is done is to have certain "scripts" embedded into the web page so that your computer executes a set of commands you didn't want or expect (or even notice that the page was doing it).
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